Impedance Study Of Anodic Aluminum Oxide

Abstract

The subjects of intense current scientific investigation are the physical properties of such materials with reduced dimensionality as thin films, filaments, small particles, and membranes. In the present research work, we successfully develop a new approach to the application of mesoporous membrane - anodic aluminum oxide. That is faced up to the growing demands for more powerful electronic devices and functional materials for Nanoelectronics or/and power sources. The conditions of such application are defined. Usually, high dielectric permittivity and low loss are required for those applications. Therefore, the structure, polarization, and resistance properties of anodic aluminum oxide are tested. Such modern method as impedance spectroscopy is used to evaluate these characteristics. Impedance spectroscopy evidences low dielectric loss of anodic aluminum oxide obtained in the high-frequency range <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$(\boldsymbol{10^{2}\div 10^{6}}\ \mathbf{Hz})$</tex> at room temperature. The value of loss tangent <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\boldsymbol{(&lt; 0.2)}$</tex> with a simultaneously high value of dielectric permittivity is important for the application of the material, indicates a high-quality factor of the material, and opens the prospect of its use as an active material of radiofrequency capacitors.